National Neighborhood Crime Study, Wave 2 (NNCS2), [United States], 1999-2013

The primary purpose of the second wave of the National Neighborhood Crime Study (NNCS2) was to develop a panel dataset of serious reported crimes in urban neighborhoods circa two time points - 2000 and 2010. These data offer the opportunity to assess the sources and consequences of neighborhood crime change for "communities" of different ethno-racial and economic compositions across the United States. The study also sought to examine the role of a neighborhood's broader ecology on crime levels and crime change by integrating indicators of city and/or metropolitan conditions. The NNCS2 includes two datasets. The first dataset, the NNCS2-Panel file (NNCS2-P), contains information on the Federal Bureau of Investigation's (FBI) Part 1 Index crimes (except arson), socioeconomic and demographic characteristics, and a variety of other neighborhood and city level controls for circa 2000 and 2010 for tracts in 81 of the 91 cities in the NNCS, wave 1. The second dataset, the NNCS2-Cross-Sectional file (NNCS2-CS), allows for examination of the local and contextual sources of neighborhood crime inequality circa 2010. The NNCS2-CS incorporates parallel data for census tracts and cities as in the Panel file, but includes a few additional cities for which panel data could not be compiled, as well information on the metropolitan areas within which cities are located.

第二波全国社区犯罪研究（NNCS2）的主要目的是构建一份包含约2000年和2010年两个时点的城市社区严重报告犯罪数据的面板数据集。这些数据为评估美国不同民族种族和经济构成的社区在社区犯罪变化方面的来源和后果提供了可能。研究还旨在通过整合城市及/或大都市地区的条件指标，探讨社区更广泛的生态对犯罪水平及犯罪变化的影响。NNCS2包含两个数据集。第一个数据集，NNCS2-Panel文件（NNCS2-P），包含了美国联邦调查局（FBI）第一类指数犯罪（除纵火外）的信息，社会经济和人口统计特征，以及约2000年和2010年NNCS第1波中91个城市中的81个区域的社会经济和人口统计特征，以及各种社区和城市层面的控制变量。第二个数据集，NNCS2-横断面文件（NNCS2-CS），允许研究约2010年社区犯罪不平等的地方和情境来源。NNCS2-CS整合了与Panel文件中相同的街区和大都市数据，但增加了无法编制面板数据的几个城市的数据，以及城市所在大都市地区的信息。